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The observer design pattern is a behavioural pattern listed among the 23 well-known "Gang of Four" design patterns that address recurring design challenges in order to design flexible and reusable object-oriented software, yielding objects that are easier to implement, change, test and reuse.
Computer Science Design Patterns/Observer; Computer Science Design Patterns/Print version; User:Dirk Hünniger/Computer Science Design Patterns; Usage on fr.wikipedia.org Observateur (patron de conception) Usage on he.wikipedia.org תבנית עיצוב; תבנית צופה; Usage on hu.wikipedia.org Megfigyelő programtervezési minta
A sample UML class and sequence diagram for the Observer design pattern. In the above UML class diagram , the Subject class doesn't update the state of Observer1 and Observer2 directly. Instead, Subject refers to the Observer interface for updating (synchronizing) state ( for each o in observers: o.update() ), which makes the Subject ...
A sample UML class and sequence diagram for the mediator design pattern. [5] In the above UML class diagram, ... (implemented using the observer pattern). ...
A visitor pattern is a software design pattern that separates the algorithm from the object structure. Because of this separation, new operations can be added to existing object structures without modifying the structures.
The following diagram illustrates the class hierarchy of the various graphic templates defined by the UML. Structure diagrams define the static structure of an object: its place in the class hierarchy, its relation to other objects, etc. Behavior diagrams specify the dynamic aspects of the model, business process logic, coordination and timing ...
UML diagram types; Structural UML diagrams; Class diagram; Component diagram; Composite structure diagram; Deployment diagram; Object diagram; Package diagram; Profile diagram; Behavioral UML diagrams; Activity diagram; Communication diagram; Interaction overview diagram; Sequence diagram; State diagram; Timing diagram; Use case diagram
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